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WWF Ecoregions WWF Ecoregions For more information, please see: http://worldwildlife.org/biomes As an indication of the predominant ecosystem/habitat in a Verified Conservation Area, we ask for VCAs to be categorized as one of these ecoregions. 1. Terrestrial Ecoregions ................................................................................................. 2 1.1 Deserts and xeric shrublands ....................................................................................................... 2 1.2 Tropical and subtropical moist broadleaf forests ................................................................ 3 1.3 Tropical and subtropical dry broadleaf forests ..................................................................... 5 1.4 Tropical and suptropical coniferous forests ........................................................................... 6 1.5 Temperate broadleaf and mixed forests ................................................................................. 7 1.6 Temperate Coniferous Forest ...................................................................................................... 8 1.7 Boreal forests / Taiga .................................................................................................................... 10 1.8 Tropical and subtropical grasslands, savannas and shrublands ................................... 11 1.9 Temperate grasslands, savannas and shrublands .............................................................. 12 1.10 Flooded grasslands and savannas ......................................................................................... 13 1.11 Montane grasslands and shrublands ................................................................................... 14 1.12 Tundra .............................................................................................................................................. 15 1.13 Mediterranean Forests, woodlands and scrubs ................................................................ 16 1.14 Mangroves ...................................................................................................................................... 17 2. Freshwater Ecoregions ............................................................................................. 18 2.1 Large river ecosystems ................................................................................................................. 18 2.2 Large river headwater ecosystems ........................................................................................... 18 2.3 Large river delta ecosystems ...................................................................................................... 18 2.4 Small river ecosystems ................................................................................................................. 19 2.5 Large lake ecosystems .................................................................................................................. 19 2.6 Small Lake Ecosystems ................................................................................................................. 19 2.7 Xeric basin ecosystems ................................................................................................................. 20 3. Marine Ecoregions .................................................................................................... 20 3.1 Polar Ecoregions ............................................................................................................................. 20 3.2 Temperate Shelf and seas ecoregions .................................................................................... 20 3.3 Temperate Upwelling .................................................................................................................... 21 3.4 Tropical Upwellings........................................................................................................................ 21 3.5 Tropical Coral ................................................................................................................................... 22 WWF Ecoregions – downloaded June 2013 - page 1 1. Terrestrial Ecoregions 1.1 Deserts and xeric shrublands Worldwide, Deserts and Xeric Shrublands vary greatly in the amount of annual rainfall they receive; generally, however, evaporation exceeds rainfall in these ecoregions, usually less than 10 inches annually. Temperature variability is also extremely diverse in these remarkable lands. Many deserts, such as the Sahara, are hot year-round but others, such as Asia's Gobi, become quite cold in winter. Temperature extremes are a characteristic of most deserts. Searing daytime heat gives way to cold nights because there is no insulation provided by humidity and cloud cover. Not surprisingly, the diversity of climatic conditions - though quite harsh - supports a rich array of habitats. Many of these habitats are ephemeral in nature - reflecting the paucity and seasonality of available water. Woody-stemmed shrubs and plants characterize vegetation in these regions. Above all, these plants have evolved to minimize water loss. Animal biodiversity is equally well adapted and quite diverse. The Namib-Karoo deserts of southwestern Africa support the world’s richest desert floras, while the Chihuahuan Desert and central Mexican deserts are a close second and are the richest Neotropical deserts. Australian deserts support the richest reptile faunas. The Carnavon Xeric Scrub of western Australia is a regional center of endemism for a range of taxa. Unusual desert communities dominated by giant columnar cacti occur in the Sonoran and Baja deserts of North America, while the spiny deserts and shrublands of southwestern Madagascar are globally unique in terms of structure and taxa (although some Baja California communities are partially convergent in structure). The Atacama Desert ecoregion of western South America (as well as the adjacent transition area of the Monte / Puna / Yungas) and the Horn of Africa deserts were recognized as some of the more outstanding regional centers of richness and endemism. The Central Asian deserts, while not nearly as rich as Afrotropical or Neotropical deserts, are representative of the region’s deserts. Biodiversity Patterns Deserts and xeric shrublands may have extraordinarily rich floras with very high alpha and beta diversity; reptile faunas may also be very diverse; local endemism may be quite pronounced in some regions. WWF Ecoregions – downloaded June 2013 - page 2 Minimum Requirements Many species track seasonally variable and patchy resources and require large natural landscapes to persist; water sources and riparian habitats are critical for the persistence of many species. Sensitivity to Disturbance Highly sensitive to grazing, soil disturbance, burning, plowing, and other cover alteration; restoration potential can be very low and regeneration very slow; exotic species may be a serious problem. 1.2 Tropical and subtropical moist broadleaf forests Generally found in large, discontinuous patches centered on the equatorial belt and between the Tropics of Cancer and Capricorn, Tropical and Subtropical Moist Forests (TSMF) are characterized by low variability in annual temperature and high levels of rainfall (>200 centimeter annually). Forest composition is dominated by semi-evergreen and evergreen deciduous tree species. These trees number in the thousands and contribute to the highest levels of species diversity in any terrestrial major habitat type. In general, biodiversity is highest in the forest canopy which can be divided into five layers: overstory canopy with emergent crowns, a medium layer of canopy, lower canopy, shrub level, and finally understory. These forests are home to more species than any other terrestrial ecosystem: Half of the world's species may live in these forests, where a square kilometer may be home to more than 1,000 tree species. These forests are found around the world, particularly in the Indo-Malayan Archipelagos, the Amazon Basin, and the African Congo. A perpetually warm, wet climate promotes more explosive plant growth than in any other environment on Earth. A tree here may grow over 75 feet in height in just 5 years. From above, the forest appears as an unending sea of green, broken only by occasional, taller "emergent" trees. These towering emergents are the realm of hornbills, toucans, and the harpy eagle. The canopy is home to many of the forest's animals, including apes and monkeys. Below the canopy, a lower understory hosts to snakes and big cats. The forest floor, relatively clear of undergrowth due to the thick canopy above, is prowled by other animals such as gorillas and deer. All levels of these forests contain an unparalleled diversity of invertebrate species, including New Guinea’s unique stick insects and bird wing butterflies that can grow over one foot in length. These forests are under tremendous threat from man. Many WWF Ecoregions – downloaded June 2013 - page 3 forests are being cleared for farmland, while others are subject to large-scale commercial logging. An area the size of Ireland is destroyed every few years, largely due to commercial logging and secondary impacts. Such activities threaten the future of these forests are the primary contributor to the extinction of 100-200 species a day on average over the next 40 years (exotics on islands and loss of island habitats are other major factors) At the current rate of deforestation, more than 17,000 species will go extinct every
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